Abstract: Disclosed herein is an apparatus and method for controlling a linear compressor. The linear compressor control apparatus has a collision detection unit, a control unit, and a compressor driving unit. The collision detection unit detects a collision of a piston with a valve due to the operations of the linear compressor. The control unit determines whether the collision of the piston occurs on the basis of an output signal from the collision detection unit, and resets maximum amplitude data of the piston of the linear compressor when the collision occurs. The compressor driving unit controls the maximum amplitude of the piston of the linear compressor under the control of the control unit.

Abstract: A vibration type compressor related to the present invention, in which a compressor main body 3 is built into a gastight vessel 2 including a yoke 7-1, a magnetic path member 7 formed from a column-shaped core pole 7-2, a permanent magnet 12 arranged in the magnetic path, an electromagnetic coil 14 which is arranged within an annular magnetic gap 13 between the magnetic path members 7 by being supported by a mechanical vibration system to as to be able to vibrate and is wound around a lead plate to perform the connection treatment of a terminal thereof, a piston 16 connected to the electromagnetic coil 14, and a cylinder block 8 which closes the yoke 7-1 and in the interior of which is formed the cylinder portion 17 housing the piston 16, characterized in that the permanent magnet 12 is formed from a neodymium magnet or a rare-earth magnet and in that the cylindrical permanent magnet 12 is divided into four parts in the axial direction thereof, the four-part divided magnet being bonded and fixed to the side o

Abstract: An apparatus for supplying energy to a sensor co-moved with a wheel of a vehicle, which contains a generator co-moved with the wheel of the vehicle, the generator generating electrical energy from vibrational motions of the vehicle.

Abstract: A linear actuator has inner yokes, outer yokes forming gaps between themselves and the inner yokes, and a movable body provided with planar magnets in the gaps. Eight pieces each of the inner yokes and the outer yokes are arranged at equal angular intervals in a circumferential direction with planar faces of each of the inner yokes and the of the outer yokes being opposed to each other. The movable body has magnet retaining portions having a substantially triangular shape and placed between adjacent inner yokes and between adjacent outer yokes. A linear actuator having high magnetism usability can be structured using magnetic parts suitable for mass production.

Abstract: An industrial process field device with improved power generation is provided. The process device can be a process variable transmitter, process actuator, or any other suitable field device. The field device includes a wireless transceiver that transceives information related to the process via a wireless medium. A power supply within the field device is couplable to a source of pressurized gas and generates motion within the power supply that is translated into electrical energy. This electrical energy is then used to operate the field device.

Abstract: A reciprocating compressor comprises an inside stator formed by piling a plurality of stator cores to have an actinomorphic cylinder shape, which is press-fitted to a frame, and a streak protection member and a burr shielding ring installed between the inner aspect of the inside stator and corresponding outer aspect of the frame. Thereby the burr generating between the frame and the inner stator by a streak is prevented previously, and even if a burr is generated, this burr is locked in a burr escape unit in the burr-shielding ring. Therefore degrading of valve function and an abrasion of a sliding unit in a compressing unit by the burr generating is prevented and the vibration noise of the compressor is reduced by assembling the frame and the inside stator strongly.

Abstract: A linear oscillator includes a reciprocating moving part, a case to contain the moving part, and an amplitude control spindle moveably supported in the case. The moving part and the amplitude control spindle reciprocate at a frequency approximately equal to the resonance frequency of the linear oscillator.

Abstract: A linear actuator includes an inner yoke, an outer yoke and a coil for generating a magnetic field between the outer yoke and the inner yoke. The outer yoke includes a first facing portion facing the inner yoke and a second facing portion which faces the inner yoke. An insulating coil bobbin around which the coil is wound includes an engaging part which engages with both the first facing portion and the second facing portion of the outer yoke. A magnet is disposed between the inner yoke and the outer yoke and a movable body is integrally connected with the magnet. An alternating magnetic field is generated by the coil such that the movable body along with the magnet is reciprocally moved in the axial direction in conjunction with the alternating magnetic field.

Abstract: A stator for a reciprocating motor includes a bobbin made of an insulating material in which a winding coil is located; a terminal unit forming a single body with the bobbin and connecting the winding coil electrically with an outer power source; and a core unit stacked radially along with the bobbin started from one side of the terminal unit. Therefore, the winding coil and the bobbin can be coupled in simple way, and the core unit can be stacked simply and precisely, so the mass productivity of the motor is able to be increased. Also, the size of the core unit is able to be managed simply and precisely, and then, the contact and impact with other components constructing the motor is prevented, whereby the reliability of the motor can be improved.

Abstract: An electromagnetic linear generator and regenerative electromagnetic shock absorber is disclosed which converts variable frequency, repetitive intermittent linear displacement motion to useful electrical power. The innovative device provides for superposition of radial components of the magnetic flux density from a plurality of adjacent magnets to produce a maximum average radial magnetic flux density within a coil winding array. Due to the vector superposition of the magnetic fields and magnetic flux from a plurality of magnets, a nearly four-fold increase in magnetic flux density is achieved over conventional electromagnetic generator designs with a potential sixteen-fold increase in power generating capacity.

Abstract: A planar motor permits a thinner design, controlled vibration, and highly accurate positioning by disposing X-axis and Y-axis coreless type linear motors on the same plane without using an expensive linear guide and by incorporating high-accuracy capacitance displacement sensors in X and Y directions. Two pairs of permanent magnets are disposed such that they are respectively orthogonalized with respect to two axes that are orthogonalized with each other on a movable stage and that they generate magnetic fluxes in a direction perpendicular to a surface of the movable stage. Furthermore, the permanent magnets of one pair are disposed symmetrically to each other about one of the two axes, while those of the other pair are disposed symmetrically to each other about the other axis. Two pairs of coils are provided such that they oppose and match the two pairs of permanent magnets.

Abstract: Linear electric generators include stationary windings and armature magnets arranged to reciprocate axially relative to the windings, or stationary magnet structures and movable windings arranged to reciprocate relative to the stationary magnet structures. The armature magnets or stationary magnet structures are in the form of multiple pole magnets made up of a plurality of individual pole structures, each pole structure including a pair of magnets joined to each other with facing poles of like polarity. In addition, the windings may be in the form of a double winding structure including at least one first clockwise winding and at least one second counterclockwise winding arranged in a multi-layered stacked arrangement.

Abstract: A mobile host device configured to draw electrical energy from an energy storage device includes a disk drive. The disk drive includes a disk drive enclosure including a base, a spindle motor attached to the base, a disk positioned on the spindle motor, a generator and a charging circuit. The generator may be coupled to the disk drive enclosure and/or the mobile host device and generates electrical energy from the motion of the mobile host device and/or disk drive. The charging circuit is configured to charge the energy storage device using the electrical energy generated by the generator.

Abstract: A linear electrodynamic system for conversion of mechanical motion into electrical power or conversion of electrical power into mechanical motion allows for advantageous mass and size reductions. Magnet volume is increased through use of non-annular shaped magnets affixed to stator poles. Mover sections complementary in shape to the non-annular magnets. The mover, stator and associated windings used have reduced mass and size resulting in overall mass and size reductions of the innovative linear electrodynamic system compared with conventional linear electrodynamic systems of similar performance capability.

Abstract: An essentially iron-free linear motor for a sewing device or sewing machine produces and controls the pressure on the material being sewn by means of a drive rod, with a tubular housing, with at least two annular permanent magnets located therein. Each of the magnets has a north pole and a south pole and is magnetized radially, each in a different magnetization direction, and with a coil divided into at least two partial coils wound in opposite directions and each associated with a permanent magnet, whereby the partial coils and the permanent magnets are mutually displace, involving drive rod, in a magnetic lock that is effected by the housing, by a core in the form of center piece, and an air gap with the coil. The partial coils are located inside housing and the permanent magnets are located between said coils and the center piece.

Abstract: A power generator. The power generator includes a first substrate, a second substrate, a magnetic film, a first metal layer, a second metal layer and an electricity storage device. The second substrate is disposed on the first substrate. A vibration chamber is formed between the first substrate and second substrate. The magnetic film is disposed between the first substrate and second substrate and located in the vibration chamber. The magnetic film has a predetermined magnetic field. The first metal layer is disposed under the first substrate and is aligned with the vibration chamber. The second metal layer is disposed on the second substrate and is aligned with the vibration chamber. The electricity storage device is electrically connected to the first metal layer and second metal layer.

Abstract: In electric motor assemblies, separating the x and y coils may achieve significant advantages. An advantageous design includes pairs of interacting magnet array/coil arrays. Separated coil arrays are provided, with a coil array on an arm connected to a following stage, and another coil array on a stage base (the stage being one to which is attached magnet arrays). Positioning devices, moving magnet motor assemblies, moving coil motor assemblies, and methods of driving a stage are provided. By differential driving and creation of torques about the x and y axes, a stage may be driven in six independent degrees of freedom.

Abstract: The present invention is directed to a coil unit of a single-acting linear engine. The coil unit includes an iron core with coils that are linked with the iron core by way of a cast compound thereby forming a molded part. The molded part is enclosed by a housing having a narrow circumferential gap formed between the housing and the molded part. Through the gap, cooling air may flow or be blasted. The air extensively cools the iron core with the coils and thermally insulates the housing from the iron core and the coils.

Abstract: A magnet assembly includes a back iron and an array of magnets. The back iron is in the form of a plate having opposed surfaces. The magnets are arranged along one of the surfaces, with the other surface being dimensioned and configured according to the magnetic field distribution associated with the magnets. The back iron geometry provides for reduced mass, reduced leakage flux, and high flux densities to improve performance of a linear motor that employs such a magnet assembly.

Abstract: A linear motor having a reduced size, and capable of being manufactured at reduced cost and having improved efficiency is provided. The linear motor includes a bobbin, a plurality of coil groups wound on the bobbin, the coil groups have different coil thickness, and a magnet linearly movable due to a magnetic field generated by the coil groups.

Abstract: A rotation/displacement converting actuator has an actuator unit constituted by a displacing body and an actuator in which the displacing body can be linearly displaced. The actuator has a pair of plate-shaped bases, a rotor, a vibrating element that rotates the rotor, and a cam mechanism for converting rotary motion of the rotor to linear motion of the displacing body. The rotor is fixed to a shaft to which the rotor (cam rotor) is fixed. An outer circumferential surface of the rotor constitutes a cam surface of the cam mechanism. A roller is provided at a tip portion of the displacing body. The roller abuts on the outer circumferential surface (cam surface) of the rotor.

Abstract: An apparatus adopting an iron core and an inertial mass is disclosed for exerting high power output by converting a sound signal to vibration so as to stimulate the human hearing organs through the bones. A sound-to-vibration conversion apparatus comprises a housing, a permanent magnet having an N-pole and an S-pole, only one pole of which is fixed to the housing, an electromagnet movably installed into the housing faced either the S-pole or N-pole of the permanent magnet, whichever one is not fixed to the housing, and an inertial mass for amplifying the inertial force of reciprocating movement of the electromagnet, so that the housing with the permanent magnet can be vibrated by the electromagnet, whereby the electromagnet vibrates in a reciprocating fashion towards or away from the permanent magnet in accordance with the incubation between the polarity formed at the electromagnet by acoustic signal applied to the electromagnet and either the N-pole or the S-pole of the permanent magnet.

Abstract: A reciprocating motor in which a plurality of eddy current preventing holes (26) are formed in the directions of circumference and shaft of a magnet frame (10) in a magnet mounting portion (12) of the magnet frame (10)connected between the magnet (8)and component part which will perform a reciprocating movement, for transmitting a reciprocating movement of the magnet (8) to a component part, to prevent deformation of the magnet frame (10)in molding the eddy current (26) and maintain roundness of the magnet frame precisely by improving the structure of the eddy current preventing holes which are molded in the magnet frame.

Abstract: A manually operated voltage generating device provides an electrical voltage for operating an electronic unit such as a remote control handheld unit. The device has a permanent magnet mounted in a horizontal manner at the underside of a mild steel plate. The magnet is normally located in a spaced manner from the central post of an E-shaped core. A winding is wound on the central post. A compression spring mounted over the core maintains the magnet normally spaced above the core. The mild steel plate is operative in an up and down manner against the spring force of the spring to move the magnet in a reciprocating movement relative to the core so as to generate a current in the winding. The current charges a capacitor, and the voltage across the capacitor provide the electrical voltage for operating the electronic unit.

Abstract: A magnetic linear drive has a coil in whose interior the current can produce a magnetic flux in an axial directions, having an armature which can move only at right angles to the axial direction and which has a magnetically active part which is magnetized, in particular, parallel to, but in the opposite direction to, the axial direction. The armature is driven by a current surge which accelerates the magnetically active part toward the coil center irrespective of its initial position.

Abstract: A bobbin for a reciprocating motor and fabricating method thereof includes the bobbin comprising a bobbin body (310) including a first sidewall unit (312) and a second sidewall unit (313) forming a certain space in the body by extending at a certain height so as to have slopped part from both side of the bottom (311) having a ring form with a certain width; a winding coil (320) wound a plurality of times in the space of inner side of the bobbin body; (310) and a cover (330) couple to the bobbin body (310) so as to cover the winding coil (320), and a molding step for fabricating the bobbin, thereby fabrication of the winding coil and laminated outer core constituting the motor is simplified, the length of the permanent magnet constituting the mover can be shortened. So, fabricating cost of the motor can be reduced and mass productivity of the motor can be improved.

Abstract: A linear motor comprises a stator including a stator yoke and a plurality of permanent magnets arranged side by side on the stator yoke along a motor running direction in alternately reversed directions to produce alternating polarities, and a moving part including a plurality of magnetic teeth arranged along the motor running direction and coils wound around the individual magnetic teeth. Cutouts formed in end surfaces of yoke portions of the individual magnetic teeth opposite to their side facing the stator line up to form a groove-shaped channel running through the yoke portions of the successive magnetic teeth, and the multiple magnetic teeth are joined together into a single structure by fitting a connecting bar in the groove-shaped channel.

Abstract: A linear motor includes an outer yoke formed of a core made of thin magnetic plates laminated and a coil, an inner yoke formed of a core made of thin magnetic plates laminated and permanent magnets rigidly stuck on this laminated core, and an output shaft fixed to the inner yoke.

Abstract: A resonant electrical generation system includes a resonator, an energy source, and an electrical generator. The resonator provides resonating movement in a resonating element. The resonator can include a mass and spring element. The energy source is operatively coupled to the resonator to maintain resonating movement of the resonating element. The energy source can be a pulsatile linear combustor. The electrical generator is operatively coupled to and driven by the resonator to generate electrical power from the resonating movement.

Abstract: A linear oscillator includes a reciprocating moving part, a case to contain the moving part, and an amplitude control spindle moveably supported in the case. The moving part and the amplitude control spindle reciprocate at a frequency approximately equal to the resonance frequency of the linear oscillator.

Abstract: A voice coil actuator is disclosed which provides a proportional solenoid type characteristic and in which first and second magnets are positioned at different ends of a first soft magnetic pole piece and magnetized in opposite directions, the first soft magnetic pole piece having a length greater than the length of the first magnet and the length of the second magnet. A coil having a length less than the lengths of the first soft magnetic pole piece is positioned for travel along an axis common to the first soft magnetic pole piece and first and second magnets, and a structure provides a magnetic path between free ends of the first and second magnets.

Abstract: The present invention provides an improved design of linear motor as well as an improved control strategy. The design allows for a shorted stator, where the armature magnets are controlled to reciprocate to a greater maximum displacement that for a equivalent conventional linear motor. The control strategy is such that a minimum of external sensors are required. The linear motor is driven at its resonant frequency ensuring optionally efficient operation. A determination of the maximum current is made based on a relationship with the resonant frequency and the evaporating temperature/pressure of the vapor entering the compressor. The current is then limited to control the maximum displacement to avoid damage.

Abstract: Disclosed is a reciprocating motor including a multi type outer core having a plurality of single cores constructed with consecutively-stacked lamination sheets centering around a plurality of ring-shaped winding coils so as form a cylindrical structure and an insulating member placed between a plurality of the single cores, an inner core inserted in the multi type outer core so as to leave a predetermined gap with an inside circumferential face of the multi type outer core, and a moving part having a plurality of magnet rows confronting the winding coils of the multi type outer core respectively so as to reciprocate in accordance with a variation of currents flowing through the winding coils. The present invention generates simple fluxes formed in the flux paths and prevents the fluxes from being cancelled each other, thereby enabling to increase an efficiency of a motor by decreasing the magnetic saturation as well as provide a simple design of the motor.

Abstract: An ultra-low profile vibrating transducer, particularly suited for floor mat and ultra thin vibrating pad and multimedia tactical feedback applications, using an “I” core coil in the center and permanent magnets positioned at both ends of the “I” core to create balanced push-pull vibrating actions. Mounting methods to effectively transfer energy to the users while withstanding user's body weight. “I” core coil may be driven by AC power, pulsed and/or DC power or audio power. Elastomeric supports are configured to provide rotational leverage action to further enhance the vibrating effectiveness.

Abstract: A potential difference is applied between a movable electrode disposed a facing surface of a movable member, which the facing surface confronts a substrate extended in a predetermined direction or a vibrating member supported on the substrate vibratably in the predetermined direction, and a counter electrode disposed on the substrate or the vibrating member so as to confront the movable electrode. The applied potential difference causes an electrostatic force to act such that an apparent friction between the vibrating member and the movable member is greater than an apparent friction between the substrate and the movable member when displacing the vibrating member in a desired direction relatively on the substrate by vibrating in the predetermined direction, and thereby the movable member is relatively moved in the desired direction on the substrate.

Abstract: A motor structure for a reciprocating compressor, by which an power lowering of the motor can be prevented by installing a magnet to be eccentric toward a direction compressing a fluid to compensate a backward moved amount of the magnet by compression pressure during operating the compressor and a motor saturation can be prevented, comprises: an outer core of cylindrical shape fixed inside a sealed chamber and including a winding coil wound therein; an inner core disposed on an inner circumferential surface of the outer core with a predetermined gap for forming a flux with the outer core when an electric source is applied to the winding coil; and a magnet disposed between the outer core and the inner core so as to move linearly for making a piston to perform a linear reciprocating movement, wherein an initial mid position of the magnet is located to be eccentric as a predetermined distance from a mid position of the outer core and of the inner core toward a moving direction of the piston when a fluid is compr

Abstract: Linear actuators comprised of a plurality of geometric links connected together in displacement multiplied fashion by a plurality of SMA wires. The links may have a trigon or chevron configuration. The trigon links may be combined with a hexagonal or rhomboidal shaft to create a defined stacking pattern of links about the shaft. The shaft extends from the medial portion of the stack. Ohmic heating circuits connect to non-moving ends of SMA wires. Various groupings of links in parallel displacement are described.

Abstract: A wave power generator is characterized by an elongate inner member extending vertically in a body of water with its lower end constrained against vertical movement beneath the surface of the water, and an elongate outer flotation member mounted for linear movement along the length of the inner member in response to wave action. The outer member moves along the inner member with the length of the outer member extending along the length of the inner member. Movement of the outer member relative to and along the inner member effects relative linear movement between a coil and magnet to generate electrical power. The wave power generators may be used to supply electrical power to deep water hydrogen generators in which water is electrolyzed at great depths underwater to generate compressed hydrogen gas.

Abstract: An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between the magnet and a support structure. The ferrofluid bearings establish a field expansion medium that directs at least a portion of the magnetic field so that a greater portion of the field intersects the conductors than in the absence of the medium. The magnet aspect ratio is preferably on the order of unity.

Abstract: A moving coil transducer which comprises a yoke, permanent magnet and pole piece which are assembled to form a magnet circuit leaving an air gap between two opposing surfaces of the yoke and pole piece for receiving the moving coil. The permanent magnet is positioned between other opposing surfaces of the yoke and pole piece, and its faces are not parallel. Thus the thickness of the magnet increases away from the air gap of the magnetic circuit. In an annular or toroidal design in which the pole piece, permanent magnet and yoke are all annular and define an annular air gap, the magnet may be of conical form, having a thickness which increases away from the air gap. The pole piece and yoke are correpondingly tapered at the portions which meet the permanent magnet. The use of the non-flat magnet allows more magnetic material to be included in the transducer without increasing the overall volume of the transducer.

Abstract: A stator fastening structure of a reciprocating motor is provided. In the stator fastening structure of a reciprocating motor, a frame which includes an outer core fixing member, to which an outer core is fixed, and an inner core fixing member, to which an inner core is fixed, wherein the outer core fixing member of the frame and the inner core fixing member of the frame are formed of different material from each other. It is possible to prevent leakage of flux to a frame, in which the reciprocating motor is loaded, to thus minimize the loss of the flux and to reduce material cost and production cost.

Abstract: An electric linear motor for driving a reciprocating load includes a stator, a coil, an armature and a commutation circuit. The stator has a magnetically permeable core with an air gap. The coil is wound around a portion of the stator and energized with a non-constant voltage for producing a non-constant magnetic flux in the stator and the air gap. The armature supports a permanent magnet having a substantial portion located in the air gap. The interaction of the magnetic field of the magnet and the non-constant flux in the air gap produces a force on the armature. The armature is connected to the load and reciprocates with respect to the stator. The circuit controls the coil such that at least one end of the magnet passes outside the region of substantially uniform flux density within the air gap during a portion of the motion of the armature.

Abstract: A free piston gas compressor comprising a cylinder, a piston reciprocable within the cylinder and a reciprocating linear electric motor derivably coupled to the piston having at least one excitation winding. A measure of the reciprocation time of the piston is obtained, any change in the reciprocation time is detected and the power input to said excitation winding is adjusted in response to any detected change in reciprocation time.

Abstract: An electrical generator includes a magnet constrained to move relative to a conductor by a support structure, with a ferrofluid bearing providing an ultra low friction interface between the magnet and support structure. The assembly has a critical angle of displacement from a horizontal static position of less than 1 degree, and preferably less than 10 minutes. An electrical signal is generated in the conductor by the moving magnetic field.

Abstract: The present invention provides an improved design of linear motor as well as an improved control strategy. The design allows for a shorted stator, where the armature magnets are controlled to reciprocate to a greater maximum displacement than for a equivalent conventional linear motor. The control strategy is such that a minimum of external sensors are required. The linear motor is driven at its resonant frequency ensuring optionally efficient operation. A determination of the maximum current is made based on a relationship with the resonant frequency and the evaporating temperature/pressure of the vapor entering the compressor. The current is then limited to control the maximum displacement to avoid damage.

Abstract: A high-precision, low backlash linear actuator drive mechanism characterized by minimal positional repeatability error irrespective of the direction from which a selected or target position is approached may comprise a bellows coupling operative to transmit rotational motion from a motor to a drive spindle. Rotation of the drive spindle causes linear translation thereof in an axial direction.

Abstract: A coil in a coil unit for a linear motor is evenly cooled in the lengthwise direction to reduce an influence of heat on the outside from the coil unit. The coil unit includes the plate-shape coil extending in a traveling direction of the linear motor, a shell for internally storing the coil while maintaining a predetermined gap to the coil, and leading a refrigerant through the gap to cool the coil, a main flow passage formed inside the shell while extending in a lengthwise direction X of the coil, and leading the refrigerant supplied from the outside into itself, and a plurality of branch flow passages formed at a predetermined interval in the lengthwise direction X on the main flow passage for leading out the refrigerant led into the main flow passage in a widthwise direction Y of the coil. The refrigerant led out from the branch flow passages after having flown through the main flow passage flows into the gap between the shell and the coil, and cools the coil along the widthwise direction Y.

Abstract: The invention refers to an electromagnetic force device arranged to provide a force, a shock absorber with such a force device, a scale with such a force device, a sewing machine with such a force device and a handling device with such a force device. The force device includes an elongated holder element (1), a first magnet element (2), which is connected to the elongated holder element (1) in such a way stationary in relation to the holder element, a second magnet element (3), which is slidably connected to the elongated holder element (1) in such a way that it is displaceable along the holder element towards and away from the first magnet element (2). At least one of said magnet elements (2, 3) includes an electromagnet. An effect unit (10) is arranged to provide an electric effect to said electromagnet for generating a force in a first direction.

Abstract: An electromechanical actuator has at least one electromagnet, an armature and a resetting device. A connector is provided, with at least one contact element, which is electro-conductively connected to the coil of the electromagnet, and which is disposed in such a way that, at least during the assembly to the actuator onto a support, it can be electrically contacted by an assembly contacting element.

Abstract: A magnet assembly includes a back iron and an array of magnets. The back iron is in the form of a plate having opposed surfaces. The magnets are arranged along one of the surfaces, with the other surface being dimensioned and configured according to the magnetic field distribution associated with the magnets. The back iron geometry provides for reduced mass, reduced leakage flux, and high flux densities to improve performance of a linear motor that employs such a magnet assembly.